Added GitHub Issue and PR templates.

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Give as much information as you can, and be sure to search existing
+  Issues first.
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of the bug.
+
+**Release version(s) and/or repository branch(es) affected?**
+Have you checked that the bug is not already fixed in newer versions?
+
+**Steps to reproduce the bug**
+Give sufficient details so that others can quickly verify the problem.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add other useful information here.
+
+**Pull requests welcome!**
+This is an Open Source project - please consider contributing a bug fix
+yourself (please read `CONTRIBUTING.md` before starting any work though).

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Give as much information as you can, and be sure to search existing
+  Issues first.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe exactly what you would like to see in an upcoming release**
+Give a clear and concise description of the new feature or behaviour, and
+reasons why you think it would be useful.
+
+**Additional context**
+Add other useful information here.
+
+**Pull requests welcome!**
+This is an Open Source project - please consider contributing code yourself
+(please read `CONTRIBUTING.md` before starting any work though).

.github/PULL_REQUEST_TEMPLATE.md

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+COMMENT: Complete this Pull Request template and delete all "COMMENT:" lines.
+
+COMMENT: Significant PRs should address an existing Issue. Choose one of:
+These changes partially address #xxxx
+These changes close #xxxx
+This is a small change with no associated Issue.
+
+COMMENT: The following requirements must be satisfied, now or before merge.
+COMMENT: Mark the PR as a Draft if not all are satisfied just yet.
+Requirements check-list:
+- [ ] I have read `CONTRIBUTING.md` and added my name as a Code Contributor.
+- [ ] My commits have logically grouped changes (use interactive rebase
+      to tidy your branch history if necessary).
+- [ ] I have not included off-topic changes (use other PRs for these).
+- [ ] I have included tests with adequate coverage.
+- [ ] I have added an entry in `CHANGES.md` for next release.